Deterministic entanglement and tomography of ion spin qubits

Details Deterministic entanglement and tomography of ion spin qubits Deterministic entanglement and tomography of ion spin qubits

2006-03-30

arxiv.org/abs/quant-ph/0603273v2

New J. Phys. 8 (2006) 188.

Physics

Quantum Physics

3 figures, 4 pages, footnotes fixed

Scientific paper

10.1088/1367-2630/8/9/188

We have implemented a universal quantum logic gate between qubits stored in the spin state of a pair of trapped calcium 40 ions. An initial product state was driven to a maximally entangled state deterministically, with 83% fidelity. We present a general approach to quantum state tomography which achieves good robustness to experimental noise and drift, and use it to measure the spin state of the ions. We find the entanglement of formation is 0.54.

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